All-in-view time transfer by use of code and carrier phase measurements of GNSS satellites

摘要

A time transmission method using a GNSS(Global Navigation Satellites System) is provided to make high-precision time transmission of the nanosecond level possible by enabling an earth station to receive GNSS satellite signals. An earth station uses precise ephemeris to secure information about the location of a GNSS satellite(S10), and then performs the pre-processing for removing abnormal data of satellite signals which have a cycle slip and a lower angle of elevation, for selecting an unknown parameter which will be estimated according to each GNSS satellite session, and for transmitting the primary time information which has lower precision(S20). The earth station performs statistical estimation of the selected unknown parameter in real-time type or post-processing type, executes precision time transmission between earth stations in each GNSS satellite, and then determines the final time comparison value(S30).